It's a little hit and miss with him. But here's what I can add.
First of all, some of his jokes are off the cuff - that is he'll go into a direction that the audience is most privy too. Most comedians do this.
Second of all he really does enjoy doing his impressions, even the old ones
3rd - After reading these reviews and your scared to pay 90 or whatever go to one of those tix4tonights.. get it cheaper.
The seating the in Lance Burton Theatre is great. I've been close and far and both times enjoyed it. Also, the band is good and although i'm not a fan of all the things they did "more cowbell!" It was nice
Gordie Brown does the same bit. but Frank is a little more sports material.